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Stockholders' equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ (138.4) $ 21.8 $ (64.4)
Other comprehensive income (loss) before reclassifications (165.0) (142.8) 38.0
Amounts reclassified from accumulated other comprehensive loss 208.1 418.5 150.1
Current period other comprehensive income (loss) 43.1 275.7 188.1
Ending Balance (269.3) (138.4) 21.8
Total      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (2,800.3) (3,076.0) (3,264.1)
Ending Balance (2,757.2) (2,800.3) (3,076.0)
Translation Adjustments      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (912.8) (977.4) (866.2)
Other comprehensive income (loss) before reclassifications (74.5) 68.3 (114.1)
Amounts reclassified from accumulated other comprehensive loss 2.6 (3.7) 2.9
Current period other comprehensive income (loss) (71.9) 64.6 (111.2)
Ending Balance (984.7) (912.8) (977.4)
Pension and Postretirement Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (1,887.5) (2,098.6) (2,397.9)
Other comprehensive income (loss) before reclassifications (90.5) (211.1) 152.1
Amounts reclassified from accumulated other comprehensive loss 205.5 422.2 147.2
Current period other comprehensive income (loss) 115.0 211.1 299.3
Ending Balance $ (1,772.5) $ (1,887.5) $ (2,098.6)